M4R, widely used as a ringtone format, refers to MPEG-4 Part 14 or MP4 file format, formally ISO/IEC 14496-14:2003,which is a multimedia container format standard specified as a part of MPEG-4. It is most commonly used to store digital video and digital audio streams, especially those defined by MPEG, but can also be used to store other data such as subtitles and still images. Like most modern container formats, MPEG-4 Part 14 allows streaming over the Internet. A separate hint track is used to include streaming information in the file. The official filename extension for MPEG-4 Part 14 files is .mp4, thus the container format is often referred to simply as MP4.

How to convert?

Step 1 Add video or audio formats

Press Add to add the AAC files you want to convert, then select M4R as the output format.

Step 2 Edit the file(Optional)

Press to play the files and the timer will start to work. Press to stop.

This feature is designed for you to measure your favorite segment.

When you want to designate the segment, you can press to set starting time and ending time.

Press to listen to the selected segment.

Step 3 Customize the audio (Optional)

As can be seen from the diagram, the panel allows you to set the expected volume and output format of the audio, and to customize the sample rate, Bit rate and channels the audio will contain.

Press to listen to the audio.

Step 4 Customize the metadata information (Optional)

We can see from the picture that the metadata information of the output audio, such as title, author, copyright, comment, album, track, can be customized merely by typing in what you want to display!

Step 5 Get your cool melody

When all settings are completed, just press Start Button to gain your favorite M4R from your output directory soon.